i am trying to build a toy where i need gear B to rotate when gear A rotates but when gear B rotate through a outforce gear A shouldnot rotate i hope that explains it well. (: Both gears are on the same axle!
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$\begingroup$ do you need both gears to be able to rotate in both directions. $\endgroup$– joojaaCommented May 26, 2023 at 23:43
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The component you are looking for is called a freewheel, a mechanism that only engages rotation in one direction and turns free in the other direction. A common application is the connection between rear-wheel and drivetrain of most bicycles. The image shows an example of how the freewheel mechanism can be designed.
Further reading and image source: https://en.wikipedia.org/wiki/Freewheel
answered May 25, 2023 at 10:51
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1$\begingroup$ A similar device can be found in starter motors used on cars. Also used for some tractor mounted lawn mowers and the drive on chainsaws... $\endgroup$ Commented May 25, 2023 at 10:58
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$\begingroup$ It's called a one-way bearing or sprag clutch $\endgroup$– DKNguyenCommented May 25, 2023 at 14:33
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$\begingroup$ OP does not really say he wants to rotate one way only. This might be it but needing linkage that rotates both on rotating a in any direction and rotating only b one way or another would be very useful. Ive used a centrifugal clutch for this in the past but that only works with high enough speeds. Anyway id really like to find a better solution for this as i can think of top of my head 10 (oh no now 20) projects that would become way better if i could find one. $\endgroup$– joojaaCommented May 26, 2023 at 23:39
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$\begingroup$ @joojaa Reading the question again, I see what you mean. Maybe OP will elaborate on what they are looking for. $\endgroup$ Commented May 27, 2023 at 15:17